DIN HALF SIZE LCD
DISPLAY HOUR METER
LH24
Hour Meters
• Large 7-digit LCD display value reading
• Unnecessary “0”s are eliminated from the upper digits
of elapsed value for easy reading
• Wide range of measurement:
0 to 3999 days 23.9 hours (exclusive for flush mounting type)
0 to 99999.99 hours
0 to 9999 hours 59.9 minutes
• Two mounting types available
LH24-F: Flush mounting type
LH24-C: PC board mounting type
PRODUCT TYPE
1) Non-voltage input type
Types
LH24-F
Flush
mounting types
LH24-C
PC board
mounting types
Part Number
with manual reset
LH24-F-DH
LH24-F-H
LH24-F-HM
LH24-C-H
LH24-C-HM
without manual reset
LH24-F-DH-N
LH24-F-H-N
LH24-F-HM-N
—
—
3 V DC
(Uses manganese dioxide
lithium battery)
20 µA
(When resetting:
20 µA)
Built-in battery
(Battery life: 10 years)
—
Rated operating voltage
Max. current
consumption
Counting range
0 to 3999 days 23.9 hours
0 to 99999.99 hours
0 to 9999 hours 59.9 min
0 to 99999.99 hours
0 to 9999 hours 59.9 min
Non-voltage input
Input
2) Voltage input type
Part Number
Types
with manual reset
LH24-F-DH-AL
LH24-F-H-AL
LH24-F-HM-AL
LH24-F
Flush
mounting types
LH24-F-DH-AH
LH24-F-H-AH
LH24-F-HM-AH
LH24-F-DH-DL
LH24-F-H-DL
LH24-F-HM-DL
without manual reset
LH24-F-DH-AL-N
LH24-F-H-AL-N
LH24-F-HM-AL-N
LH24-F-DH-AH-N
LH24-F-H-AH-N
LH24-F-HM-AH-N
LH24-F-DH-DL-N
LH24-F-H-DL-N
LH24-F-HM-DL-N
Built-in battery
(Battery life: 10 years)
Built-in battery
(Battery life: 6 years)
—
Rated operating voltage
Maximum current
consumption
Counting range
0 to 3999 days 23.9 hours
0 to 99999.99 hours
0 to 9999 hours 59.9 min
0 to 3999 days 23.9 hours
0 to 99999.99 hours
0 to 9999 hours 59.9 min
0 to 3999 days 23.9 hours
0 to 99999.99 hours
0 to 9999 hours 59.9 min
4.5 to 30 V DC
Input
100 to 120 V AC/DC
(signal reset is controlled
by non-voltage input)
200 to 240 V AC/DC
(signal reset is controlled
by non-voltage input)
SPECIFICATIONS
Input signals
Non-voltage input type
Flush mounting type
Minimum operating
signal width
Input method
PC board mounting type
Voltage input type
AC/DC input type
DC input type
40 ms (Maximum 25 ms deviation)
100 to 120 V AC/DC
200 to 240 V AC/DC
OFF: 0 to 2 V AC/DC
ON:
ON: 4.5 to 30 V DC
OFF: 0 to 2 V DC
7.5 kΩ
—
20 ms
ON: 4.5 to 30 V DC
OFF: 0 to 2 V DC
7.5 kΩ
—
20 ms
Operation
signal
Non-voltage input: Contact/Open collector
Input impedance
Residual voltage
Min. signal reset width
Input method
Signal reset
Input impedance
Residual voltage
Manual reset minimum input width
20 ms
20 ms
Maximum: 1 kΩ when short-circuited
Minimum: 100 kΩ when open-circuited
0.5 V
500 ms
Non-voltage input: Contact/Open collector
Maximum: 1 kΩ when short-circuited
Minimum: 100 kΩ when open-circuited
0.5 V
500 ms
83
Characteristics
Non-voltage input type
Type
LH24-F
Flush mounting type
LC24-C
PC board mounting type
3 V DC
(manganese dioxide
lithium battery)
—
6 years
10 G (4 times on 3 axes)
30 G (5 times on 3 axes)
10 to 55 Hz: 1 cycle/min double amplitude of 0.3 mm (10 minutes on 3 axes)
10 to 55 Hz: 1 cycle/min double amplitude of 0.75 mm (1 hour on 3 axes)
-10 to +55°C
(+14 to 131°F)
-25 to +65°C
(+13 to 149°F)
35 to 85% RH
Addition (UP)
Voltage input type
AC/DC input type
DC input type
Rated operating voltage
Built-in battery
Built-in battery
Battery life
Shock resistance
Functional
Destructive
Functional
Destructive
10 years
10 years
Vibration resistance
Ambient temperature
Storage temperature
Ambient humidity
Counting direction
DIMENSIONS
LH24-F, flush mounting type (Common for non-voltage input type and voltage input type)
44.5
1.752
Reset push-key switch*
HOURMETER
24
.945
LH24
RESET
mm
(inch)
M3.5 self-up
terminal screw
Panel cutout dimensions
38.9
1.531
22
.866
22.2
+ 0.3
0
.874
+.012
0
4.5
48
1.890
.177
*Without reset push key switch is also available
28.8
1.134
10.1
.398
45
+ 0.6
0
1.772
+.024
0
Panel thickness: 1-4.5 mm
WIRING DIAGRAM
1) Non-voltage input type
2) Voltage input type
• AC/DC voltage input
Contact input
Counting input
1
2
3
Reset input
(1) Reset terminal (contact input)
Counting input
1
or
4
2
4
3
Reset input
(2) Reset terminal (open collector input)
Counting input
1
or
2
4
0V
3
Reset input
• Timing input terminals (
1
,
2
) and reset input terminals (
3
,
4
) are insulated internally.
Open collector input
Counting input
1
0V
2
3
4
0V
Reset input
• DC voltage input
(1) Contact input
Counting input
+V
0V
1
2
• Terminal
2
3
4
Reset input
+V
0V
(2) Open collector input
Counting input
+V
g
0V
Reset input
1
2
3
4
g
0V
+V
Note:
2
4
are connected internally.
4
are connected internally.
(Voltage signal is recognized when the transistor
g
is switched to OFF.)
LH24-C, PC board mounting type
5.08
.200
0.6
.024
33.02
1.300
5.08
.200
Dip terminal x8
HOURMETER
LH24
PC board pattern (Bottom view)
Main body’s
8-0.8 dia.
2.54 occupied section
8-.031 dia.
.100
15.24
.600
3.3
.130
0.5
.020
17.1
.673
19
.748
2.54
.100
RESET
1.9
.075
15.24
.600
1.9
.075
42.2
1.661
Reset push-key switch
0.3
.012
4.6
.181
WIRING DIAGRAM
Contact input
15
17
26
28
4.6
5.08 5.08
.200 .200
.181
33.02
1.300
Compatible 28-pin dip terminal
Open collector
input
Reset input
Signal input
15
17
26
28
Signal input
14
12
3
1
Reset input
14
12
3
1
Note:
15
1
3
,
12
17
, and
26
14
28
3 V DC lithium battery
3 V DC lithium battery
are connected
internally.
84
OPERATION EXPLANATION
Signal input
Reset input
Full scale
Elapsed time
PC board
mounting type
1) Time is counted while the signal input is ON. The decimal point on
the front panel LCD flashes during counting operation.
2) When the elapsed (measuring) time is fullscale, the display returns to
“0” and measurement starts from “0” again.
3) While the reset input is ON, the signal time is not counted and the
display is “0”. In the case of the PC board mounting type, while the
reset input is ON, the display does not change. However, when the
reset input becomes OFF, the display will change to “0”.
CAUTIONS
<Non-voltage
input type>
1. Since the current from the signal input
and reset input terminals [1-3
(flush
mounting type),
%-i
(PC board
mounting type)] is small, use relays
and switches which have high-reliabili-
ty contact performance.
2. When input signals are triggered
through the transistor’s open collector,
use a small signal transistor with an
I
CBO
less than 1 µA, being sure to trig-
ger them with no voltage across the
collector.
3. When connecting the signal input and
reset input wires, do not run them par-
allel to high-voltage or power cables
and avoid using the same conduit. Use
shielded wires or metallic conduits
which are as short as possible. If the
floating capacitance of the wires
exceeds 500 pF (approx. 10 m for par-
allel wires of 2 mm
2
), it will cause mal-
functions.
4. Lithium batteries are built in the flush
mounting types. Never throw them into
a fire. Do not dispose of them in trash
intended to be incinerated.
<Voltage
input type>
• AC/DC Voltage input type
1. Apply voltage to the signal input termi-
nal. Do not apply voltage to the reset
input terminal. When voltage exceed-
ing the range of the rated input voltage
is applied to the signal input terminal,
or if voltage is applied to the reset ter-
minal, it may cause break-down of
internal elements.
2. Since the current from the reset input
terminal is small, use relays and
switches which have high-reliability
contact performance.
3. When reset is triggered through the
transistor’s open collector, use a small
signal transistor with an I
CBO
less than
1 µA, being sure to trigger it with no
voltage across the collector.
4. For external reset, make a temporary
short-circuit between the rear reset ter-
minals [3-4].
• Common
1. When connecting the signal input
wires [1-2] and reset input wires
[3-4], do not run them in parallel with
high-voltage or power cables. Avoid
running signal or reset wires in a
power conduit. Use shielded wires or
metal conduits which are as short as
possible. If the floating capacitance of
these wires exceeds 500 pF (approxi-
mately 10 m for parallel wires of
2 mm
2
), it will cause malfunctions.
2. Lithium batteries are built in.
Never throw them into a fire. Do
not dispose of them in trash intended
to be incinerated.
• DC voltage input type
1.When more than 30 V DC is applied to
the signal or reset input terminals, it
may cause breakdown of internal ele-
ments.
2. For external reset, voltage is applied
between the rear reset terminals
[3-4] to the H level (4.5 to 30 V DC).
In this case, connect (–) to terminal
4
and (+) to terminal
3].
Since they are
polarized, they will not operate with
reverse polarity.
•PC board mounting type—
1. After connecting the external power,
be sure to reset it to make sure that
“0” appears on the display.
2. Battery life is calculated as follows:
t=A
I
t: Battery life (h)
I: Consumption current (mA)
A: Battery capacity when the operating
voltage becomes minimum.
3. Hand soldering:
Soldering iron
Iron tip temperature
Soldering time
30 W to 60 W
Approx. 300°C
(572°F)
Less than approx. 3 seconds
85
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